v0.20.0

Important: This image removes kernel log messages from the HDMI and UART ports.
They are now only available via dmesg. If you're debugging a boot hang, you
can re-enable prints by updating the cmdline.txt. See README.md.

• Updated dependencies

  • nerves_system_br v0.16.1-2017-11

• Bug fixes

  • Removed kernel logging from UART and HDMI to avoid interfering with other
    uses. They are rarely used on those ports.

• Enhancements

  • Reboot automatically if Erlang VM exits - This is consistent with other
    Nerves systems. See rootfs_overlay/etc/erlinit.config if undesired.

  • Start running nerves_system_linter to check for configuration errors.

  • Disable console blanking for HDMI to make it easier to capture error messages.

  • Automount the boot partition readonly at /boot

  • Support for reverting firmware.

    See Reverting Firmware for more info on reverting firmware.

    See fwup-revert.conf for more information on how fwup handles reverting.